Plug-valve.



J. MOGARTHY.

PLUG VALVE.

APPLICATION FILED APR. 16, 1913.

1,079,254. Patented Nov. 18, 1913.

q/vt li ncooco v arena FFI JOHN MCCARTHY, OF NEW YORK, N. Y.

PLUG-VALVE.

Specification of Letters Patent.

Application filed April 16, 1918.

To all whom it may concern:

Be it known that I, JOHN MCCARTHY, a citizen of the United States,residing at New York city, in the county of New York and State of NewYork, have invented certain new and useful Improvements in Plug- Valves;and I do hereby declare the follow ing to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to valves and particularly to that class known asplug valves.

The primary object of the invention is to provide means whereby a valvewill be automatically locked when turned to a closed position.

A further object of the invention is to provide a valve with anautomatically operating lock or stop for holding the valve in a closedposition and with a suitable trigger or operating lever whereby the lockmay be released and the valve opened.

With these objects in view, the invention consists in the improvedconstruction, arrangement and combination of parts of a device of thecharacter described, which will be hereinafter fully set forth andafterward specifically claimed.

In order that the construction and operation thereof may be readilycomprehended. I have illustrated in the accompanying drawing, anapproved embodiment of my invention and will now proceed to specificallydescribe the construction and operation in connection with said drawing,in which,

Figure 1 represents, in perspective, a valve equipped wth myimprovement, in open position, in which position the lock is not inoperation. Fig. 2 represents a view in elevation of the structureillustrated in Fig. 1, the valve being in closed position and lockedtherein. Fig. 3 represents, in elevation, a fragment of the valveshowing the valve plug in locked position and the locking ratchet on thevalve casing, and, Fig. 1' represents the detachable locking mechanism.

Like reference characters mark the same parts in all figures of thedrawing.

Referring particularly to the drawing, 5 indicates the valve casingwhich may be of any ordinary and Well known construction to receive theplug 6 of a valve having the usual turning handle 7. On the casing isthe ordinary polygonally shaped section 8, by means of which the valveis turned to secure it in position and in this section 8 and the body ofthe casing itself is formed a track, terminating in shoulders 9 and 10to permit of the movement, with the valve plug, of a radial bar 11projecting from the val to plug transversely of the casing in theposition shown in Fig. 2 when the valve is closed and locked, and in theposition shown in Fig. 1 when the valve is open, the closed positionbeing also illustrated in Fig. 1. This radial arm 11 and the shoulders 9and 10 limit the movement of the valve to a quarter circle or ninetydegrees, between the full open and full closed positions.

Projecting transversely from the body 5 of the valve casing is a shorttubular lug 12 having on one edge thereof, ratchet teeth 13. A screw141; is threaded into the tubular lug 12 and serves to hold in position,pivotally on said screw, a plate 15, shown in reverse position in Fig.4. through the opening 16 in which said screw projects, which plate isprovided with a slot 16 leaving a tongue 17 on one side of the slot anda tongue 18 on the opposite side thereof, a pawl member 1.) beingpivotally attached to the tongue 18 by a suitable screw 20. A. spring 21attached at one end to the lug 22 on the plate 15 is curved around onabout the same curvature as the edge of the plate 1.5 and at theopposite side thereof bears upon the pawl 19, normally pressing itinward toward the pivotal point of said plate.

lVhen the valve is in its open position as shown in Fig. 1, the radialarm 11 rests against a shoulder 9 on the polygonal head 8 and liesparallel with the casing of the valve, the locking plate 15 and itsattached pawl lever lying at substantially an angle of forty-fivedegrees in the direction of said radial bar, as clearly shown in Fig.1..

Upon turning the handle 7 of the valve to a closed position the radialbar 11 is turned around to the position shown in Fig. 3. During suchmovement the radial bar has entered the slot 16 of the locking plate 15and has turned said locking plate on its pivot 14 to the position shownin Fig. '2, in which position the pawl 19 is pressed into engagementwith the ratchet teeth 13 by the spring 21. This prevents the turning ofthe locking plate upon its pivot when an at-

